package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter" ,urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public  static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();//路径匹配器，支持通配符

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]
                {"/employee/login",
                        "/employee/logout",
                        "/backend/**", "/front/**",
                        "/common/**",
                        "/user/sendMsg",
                        "/user/login"};

        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //如果不需要处理，则直接放行
        if (check){
            filterChain.doFilter(request,response);
            log.info("本次请求{}不需要处理",requestURI);
            return;
        }
        //判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        //判断登录状态(手机用户登录)，如果已登录，则直接放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录,用户id为:{}",request.getSession().getAttribute("user"));

            Long userId=(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);

            return;
        }

        //如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }
    //路径匹配，检查本次请求是否需要放行
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
